General PCB and circuit design considerations

Discussion in 'General Electronics Chat' started by Neosec, Feb 27, 2016.

  1. Neosec

    Thread Starter Member

    Feb 25, 2013
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    From time to time I see small breakout boards or single function boards with one or two IC chips on them. The ICs often don't require any external components for their operation and yet there are a few other components on the PCB.

    What are some typical or common components that are added to PCBs (circuits) to make them more robust or reliable? I know for example, decoupling (bypass) capacitors are placed near each IC, and diodes are used with solenoids to protect from inductive kick.

    What do you like to add to your circuit designs (PCBs) and why? Reverse polarity? ESD? Over voltage? RF Noise?
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    This is entirely dependent on what is being built, why, and where it gets used.

    There are no simple answers. Sorry.
     
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  3. dl324

    Distinguished Member

    Mar 30, 2015
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    It depends on your design objectives. You do everything required to make the circuit function, then you add features to make it more robust.

    If you need to worry about dumb users, you add circuitry to protect the circuit from them.
     
  4. Neosec

    Thread Starter Member

    Feb 25, 2013
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    I suppose I was thinking of an end user at the hobby level. Like arduino shields etc.
     
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    It isn't who, it's where. An Arduino running on my desk as a clock needs considerably less protection than the same part in a car flashing a string of LEDs in a sexy turn-signal pattern.

    ak
     
  6. dl324

    Distinguished Member

    Mar 30, 2015
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    Anyone using a bare PC board and connecting things to headers should know what they're doing, or be able to learn from mistakes.
     
  7. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    I would make sure it had proper on board bypass caps so my customers would be happy.
    Umm, no. First the expense of the parts

    Then there is the loss of opportunity profits. I want happy customers who blow up my nice shinny widget to come back and buy another.
     
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